FBI agents are not paid in hourly wages, they are paid through the federal government system GS ratings which provides agents an annual salary rating for years served.
The tariff of the United States, like all actual protective tariffs, is partly revenue and partly protective, its original purpose of yielding revenue having been subordinated to that of giving protection, until it may now be best described as a protective tariff yielding incidental revenue.
This commodity based relationship creates a natural disincentive for a utility company to invest in energy efficiency programs that reduce the amount of electricity sold. The purpose of revenue decoupling is to eliminate this.